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首页> 外文期刊>Ground Water Monitoring & Remediation >Multiple Working Transport Hypotheses in a Heterogeneous Glacial Aquifer System
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Multiple Working Transport Hypotheses in a Heterogeneous Glacial Aquifer System

机译：非均质冰川含水层系统中的多个工作运移假说

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Multiple working hypotheses can be used to evaluate permissible alternative hydrogeological interpretations at sites with limited subsurface control. This approach was applied to test the viability of three conceptual aquifer system architecture models coupled with three hypothesized source locations for a 1,4-dioxane plume in a heterogeneous glacial aquifer system in Washtenaw County, Michigan. The three alternative conceptual models characterized the site hydrogeology with increasingly complex distributions of hydrostratigraphic units: (A) an effective aquifer, (B) a layered confined aquifer, and (C) a discretely heterogeneous aquifer model. Each was incorporated into an independently calibrated numerical ground water flow (MODFLOW) model. Steady-state and transient flow simulations of the alternative models were evaluated using both hydraulic flow field characteristics observed under natural conditions and the perturbed response after local remedial pumping activity began. Three plausible locations where 1,4-dioxane could have entered the aquifer system were identified using historical information at the site: (1) manufacturing waste water disposal lagoons, (2) a 60 foot (18 m) deep kettle lake, and (3) a shallow impoundment on a local stream. Advective transport modeling (MODPATH) was used to assess the consistency of the hypothesized source locations with observed contaminant migration pathways inferred from the mapped location of the plume. Evaluation of the nine combinations of hydrogeologic conceptualizations and 1,4-dioxane source locations led to elimination of four working hypotheses and discounting of two others, leading to reduced overall uncertainty and the development of new insights into the system behavior.
机译：多个工作假设可用于评估地下控制有限的地点的替代性水文地质解释。该方法被用于测试密歇根州华盛顿州一个非均质冰川含水层系统中三个概念性含水层系统体系结构模型的可行性以及三个假设的1,4-二恶烷羽流源位置。三种可选的概念模型以水文地层单位的分布日益复杂为特征来表征现场水文地质：（A）有效含水层，（B）分层承压含水层，和（C）离散非均质含水层模型。每个都被合并到一个独立校准的地下水数值流（MODFLOW）模型中。使用在自然条件下观察到的水力流场特性和局部补救泵送活动开始后的扰动响应，评估了替代模型的稳态和瞬态流动模拟。根据现场的历史信息，确定了1,4-二恶烷可能已进入含水层系统的三个可能的位置：（1）制造废水处理泻湖，（2）60英尺（18 m）深的釜湖和（3） ）在本地河流上的浅水库。迁移预测模型（MODPATH）用于评估假设的源位置与从羽流的映射位置推断出的观察到的污染物迁移路径的一致性。对水文地质概念化和1,4-二恶烷源位置的九种组合的评估导致消除了四个工作假设，并折衷了另外两个假设，从而降低了总体不确定性，并开发了对系统行为的新见解。

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